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Loans - Schedule of Allowance For Loan Losses And Recorded Investment In Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	$ 14,194	$ 14,747
Charge-offs	(129)	(260)
Recoveries	80	53
Provisions	0	0
Allowance for Loan Losses, Ending Balance	14,145	14,540
Allowance for Loan Losses, Ending Balance	14,194	14,747	$ 14,145	$ 14,194	$ 14,540
Allowance for loan losses: Ending balance: individually evaluated for impairment			928	932	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			13,217	13,262	14,540
Total Loans Receivable			952,476	907,910	866,990
Loans receivables: Ending balance: individually evaluated for impairment			11,431	11,945	10,853
Loans Receivable: Ending balance: collectively evaluated for impairment			941,045	895,965	856,137
Commercial and Industrial
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,055	2,508
Charge-offs	(40)	(64)
Recoveries	6	5
Provisions	231	244
Allowance for Loan Losses, Ending Balance	3,252	2,693
Allowance for Loan Losses, Ending Balance	3,055	2,508	3,252	3,055	2,693
Allowance for loan losses: Ending balance: individually evaluated for impairment			595	599	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,657	2,456	2,693
Total Loans Receivable			162,997	140,344	127,576
Loans receivables: Ending balance: individually evaluated for impairment			2,068	2,126	1,407
Loans Receivable: Ending balance: collectively evaluated for impairment			160,929	138,218	126,169
Commercial Real Estate
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	4,968	5,216
Charge-offs	0	0
Recoveries	61	0
Provisions	(68)	349
Allowance for Loan Losses, Ending Balance	4,961	5,565
Allowance for Loan Losses, Ending Balance	4,968	5,216	4,961	4,968	5,565
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			4,961	4,968	5,565
Total Loans Receivable			335,640	318,980	297,055
Loans receivables: Ending balance: individually evaluated for impairment			8,617	8,764	8,622
Loans Receivable: Ending balance: collectively evaluated for impairment			327,023	310,216	288,433
Commercial Real Estate Construction
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	147	112
Charge-offs	0	(135)
Recoveries	0	41
Provisions	2	96
Allowance for Loan Losses, Ending Balance	149	114
Allowance for Loan Losses, Ending Balance	147	112	149	147	114
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			149	147	114
Total Loans Receivable			18,311	15,271	15,696
Loans receivables: Ending balance: individually evaluated for impairment			0	300	374
Loans Receivable: Ending balance: collectively evaluated for impairment			18,311	14,971	15,322
Residential Mortgage
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	3,478	3,349
Charge-offs	(17)	(39)
Recoveries	10	3
Provisions	(167)	(22)
Allowance for Loan Losses, Ending Balance	3,304	3,291
Allowance for Loan Losses, Ending Balance	3,478	3,349	3,304	3,478	3,291
Allowance for loan losses: Ending balance: individually evaluated for impairment			333	333	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			2,971	3,145	3,291
Total Loans Receivable			349,716	348,539	352,044
Loans receivables: Ending balance: individually evaluated for impairment			746	755	450
Loans Receivable: Ending balance: collectively evaluated for impairment			348,970	347,784	351,594
Home Equity Lines of Credit
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	648	619
Charge-offs	0	(9)
Recoveries	0	0
Provisions	(43)	7
Allowance for Loan Losses, Ending Balance	605	617
Allowance for Loan Losses, Ending Balance	648	619	605	648	617
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			605	648	617
Total Loans Receivable			71,336	70,072	60,272
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			71,336	70,072	60,272
Consumer
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	923	1,083
Charge-offs	(72)	(13)
Recoveries	3	4
Provisions	(15)	(24)
Allowance for Loan Losses, Ending Balance	839	1,050
Allowance for Loan Losses, Ending Balance	923	1,083	839	923	1,050
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			839	923	1,050
Total Loans Receivable			14,476	14,704	14,347
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			14,476	14,704	14,347
Unallocated
Allowance for Loan Losses [Roll Forward]
Allowance for Loan Losses, Beginning Balance	975	1,860
Charge-offs	0	0
Recoveries	0	0
Provisions	60	(650)
Allowance for Loan Losses, Ending Balance	1,035	1,210
Allowance for Loan Losses, Ending Balance	$ 975	$ 1,860	1,035	975	1,210
Allowance for loan losses: Ending balance: individually evaluated for impairment			0	0	0
Allowance for loan losses: Ending balance: collectively evaluated for impairment			1,035	975	1,210
Total Loans Receivable			0	0	0
Loans receivables: Ending balance: individually evaluated for impairment			0	0	0
Loans Receivable: Ending balance: collectively evaluated for impairment			$ 0	$ 0	$ 0

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Allowance for Loan Losses [Roll Forward]

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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